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Makes it easy to work with Python projects containing lots of packages, of which you only want to develop some.

Project description

mxdev is a utility that makes it easy to work with Python projects containing lots of packages, of which you only want to develop some.

It builds on top of the idea to have stable version constraints and then develop on top of it.

Other software following the same idea are mr.developer for Python’s zc.buildout or mrs-developer for NPM packages.


Given a requirements.txt (or similar named) file which itself references a constraints.txt file inside.

Create an INI file, like sources.ini in configparser.ExtendedInterpolation syntax.

The main section must be called [settings], even if kept empty. In the main sections the input and output files are defined.


Main requirements file to start with. This can be an URL too. Default: requirements.txt


Output of the combined requirements including development sources to be used later with pip install. Default: requirements-dev.txt


Output of the combined constraints. Default: constraints-dev.txt

Additional, custom variables can be defined as key = value pair. Those can be referenced in other values as ${settings:key} and will be expanded there.

Subsequent sections are defining the sources.


The section name is the package name.

url = URL

the URL to the source in VCS and must follow the [pip install editable]( format. Attention, this differs from the format one copies from Github/Gitlab, etc. The URL is required.


the branch name or tag to checkout. Defaults to main.

extras = EXTRA1,EXTRA2

(not yet implemented)


Run mxdev -c sources.ini.

Now use the generated requirements and constrainst files with pip install -r FILENAME.

Hint: to configure a target directory for the sources call pip install --src TARGET_DIRECTORY -r FILENAME.

Example Configuration

This looks like so:

..code-block: INI

[settings] requirements-in = requirements-infile.txt requirements-out = requirements-outfile.txt contraints-out = constraints-outfile.txt

# custom variables github = git+ssh://

[] url = ${settings:github}orga/ branch = fix99 extras = test,baz



There is a constraint file like -c constraints.txt with a package with a version pin. Then it is not possible to install this package in a requirements file editable like -r requirements.txt with -e git+ssh://


A pre-processor fetches (as this can be an URL) and expands all -c SOMEOTHER_FILE_OR_URL and -r SOMEOTHER_FILE_OR_URL files into one, filtering out all packages given in a configuration file. For each of those packages a -e ... entry is generated instead and written to a new TARGET.txt. The configuration is written in a file sources.ini in ExtendedInterpolation INI syntax (YAML would be nice, but the package must not have any dependencies to other package)


Mx (generally pronounced like mix [mɪks], or [məks] in the UK) is meant to be a gender-neutral alternative to the titles Mr. and Ms. but also associates with mix.


1.0.0a1 (2021-11-21)

  • Initial work. [jensens]

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